package cn.tedu.v3_1;

import java.io.*;
import java.net.*;
import java.util.*;

/**
 * 多人聊天室 Version 3.1
 * 服务器端---JavaOOP 封装
 */
public class Server {
    private ServerSocket serverSocket;
    //1.优化端口号提前声明：私有属性
    private static final Integer PORT=9908;

    public Server(){
        try {
            serverSocket=new ServerSocket(PORT);
        } catch (BindException e) {
            System.out.println("请检查端口号，被占用");
        }
        catch (IOException e) {
            System.out.println("客户端没有链接上");
        }
    }


    public  void start()  {
        try {
         while (true) {
          System.out.println("等待客户端连接");
          Socket socket = serverSocket.accept();
          new Thread( new ClientHandler(socket)).start();
             }
          }
          catch (IOException e) {
           System.out.println("客户端链接断开链接");
           } finally {
            if (serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
                System.out.println("服务器关闭成功");
            }
         }
    }


    public static void main(String[] args)  {
        new Server().start();
    }
    //ClientHandler多线程类：控制从客户端发来的通讯信息
    private class ClientHandler implements Runnable{
        private  Socket  socket;
        private String ip;
        private PrintWriter pw;
        private BufferedReader br;
        public ClientHandler(Socket s){
            //1.明确接入客户端   通讯类 Socket
            this.socket=s;
            //2.给明确接入客户端，ip地址
            ip=socket.getInetAddress().getHostAddress();
            //3.给明确接入客户端，读写功能
            try {
            br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
            pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
            } catch (IOException e) {
            System.out.println("客户端断开连接");
            }

        }


        public void run() {
        try {
        new Thread(()->{
        try {
        String message;
        while ((message= br.readLine())!=null) {
        System.out.println(ip+"客户端：" + message);
        System.out.print("服务器请输入：");
        }
        } catch (IOException e) {
        System.out.println("客户端发来的消息断开了");
        }
        }).start();

        Scanner input=new Scanner(System.in);
        while (true){
            System.out.println("服务器请输入：");
            String sme=input.nextLine();
            pw.println("服务器端说："+sme);
            }
          } finally {
            if (pw!=null)
            pw.close();

            if (br!=null)
            try {
            br.close();
            } catch (IOException e) {
            System.out.println("读入流断开连接");
            }

            if (socket!=null&&!socket.isClosed()){
            System.out.println(ip+"客户端退出服务器链接");
            try {
            socket.close();
            } catch (IOException e) {
            System.out.println(ip+"客户端退出服务器链接");
          }
        }
      }
    }
  }
}
